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BULUSAN VOLCANO BULLETIN 31 May 2011 8:00 A.M.

Tuesday, 31 May 2011 07:12

Bulusan Volcano’s (12.7667°N, 124.0500°E) seismic network recorded three (3) volcanic earthquakes during the past 24 hours. Steaming activity at the NW, SE, and SW thermal vents varied from wispy to weak characterized by emission of white steam clouds that reached up to 50 meters above the active vents and drifting towards southwest. Results of ground deformation survey (precise leveling) conducted last 07-11 May 2011 showed no significant change as compared with 01-05 March 2011 survey.

Bulusan Volcano’s status remains at Alert Level 1. This means that the source of activity is hydrothermal and shallow. Entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited, since the area is at risk to sudden steam and ash explosions. Due to the prevailing wind direction, residents in the northwest and southwest sectors of the volcano are reminded to take precautions against ashfalls. Civil aviation authorities must also warn pilots to avoid flying close to the volcano’s summit as ejected ash and volcanic fragments from sudden explosions may be hazardous to aircraft. If possible aircraft should avoid flying on the western side of the volcano as volcanic debris are likely to be carried in this direction by the prevailing winds. Furthermore, people living near valleys and river/stream channels should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s activity and any new significant development will be immediately relayed to all concerned.